Bearing-trimming tool



Nov. 30 1926. 1,608,659

. 'r. A. JENSEN BEARING TRI MMING' TOOL Filed March 26, 1924 2 Sheets-Sheet 1 6 24 INVENTOR T.A J ensen A TTOR NE YS Nov. 30 1926. 1,608,659

T. A JENSEN BEARING TRIMMING TOOL Filed March 26, 1924 2 Sheets-Sheet r? yum ' INVENTOR T.A Jens en A TTORNE YS Patented Nov. 30, 1926.

TREIDER A. JENSEN, OF INNISFAIL, ALBERTA, CANADA.

BEARING-TRIMMING TOOL.

Application fil ed March 26, 1924. Serial No. 702,168.

My invention relates to improvements in cutting tools, being more particularly a tool for trlmmings shaft bearing babbitts, and it consists of the constructions, combinations and arrangements herein described and claimed.

An object of the invention is to provide a small machine adapted particularly for the purpose of accurately and quickly trimming the ends of Babbitt metal bushings in the bearing caps of automobileengines.

Another object of the invention is to provide a small machine upon which a bearing cap may be placed and by which the ends of the Babbitt metal bushings may be quickly trimmed to the desired size bya few turns of a cutter handle.

Another object of the invention is to provide a machine for the purpose described having amicrometer adjustment which stops the trimming action when the bushing has been cut down to the desired length.

Other objects and advantages of the invent-ion will appear in the following specification, referencebeinghad to the accompanying drawing, in which- Figure 1 is a side elevationof enough of the rear crank shaft bearing of a Ford automobile to illustrate the bearing caps in respect to which the invention operates.

Figure 2 is a detail perspective view of the bearing cap alone.

Figure 3 is a longitudinal section of the bearing cap trimming tool.

Figure 4: is a front elevation of the tool stand.

Figure 5 is a front elevation of the rotary cutter head. i

By way of introduction thegeneral pur pose of the trimming tool should be understood. The main rear bearing 1 andthe bearing cap 2 support the heaviest load, and the cap 2 being underneath (Fig. 1) usually shows the first signs of Wear. This wearing of the rear bearing cap 2 is due to the fact that the weight of the fly wheel, a portion of the transmission, the magneto and a large proportion of the piston thrust are all imposed thereon. The resulting looseness in the rear bearing is undesirable, and this defeet can be remedied by substituting an oversize bearing cap.

It may be assumed that the bearing cap 2 in Figure 2 is an oversize cap which is to be substituted for a. worn one. This cap is oversize in length, and necessarily so in order that it may take up any end play and correctly preserve the spacing between the rear crank 3 and the adjacent magneto flange 4. However, before this oversize cap 2 can be used or put into place, the flanges 5 of the babbitt bushing 6 must be filed away until the cap will correctly fill the space it is intended to occupy.

Usually this cutting or filing is done by hand. This is not only slow work, but is very hard to do accurately. Therefore, the

'purpose of the invention is to provide a small and readily portable machine upon which the new bearing cap 2 can be mounted, and by which thebabbitt flanges 5 can quickly be trimmed down to the exact size.

The trimming tool comprises a stand 7 which has a base 8 which in practice is intended to be screwed upon awork bench. A tubular sleeve 9 at one side of the stand near the top providesboth a rest for the bearing cap 2 and a bearing for the mandrel 10 of the cutter head or holder 11. The bolt flanges 12 of the bearing cap 2 are intended to clear the block 13 (Fig. 4) when the bearing cap is seated upon the sleeve 9. The

a cap is oversize both in depth and length.

These caps vary in depth, and as it is not possible to fit the face of the bearing cap until the ends have been fitted, this clearance is necessary to allow for the variation. This causes the bushing 6 to rest on the sleeve 9, preventing side movement of the bearing and insuring a perfect alinement of the edge of the bushing with the cutters. Two or more screws l t (Fig. 13) fix the block 13 upon the stand 7. These enter from the rear as shown. Although the tubular sleeve 9 occupies the semi-circular concavity 15 of the block 13 (Fig. 4) both are entirely independent of each other. The block 13 has a tubular bore 16 in vertical alignment with the concavity 15. This bore constitutes the housing for a micrometer which is composed of a cylindrical stem 17 having a threaded bore 18 at one end to receive the threaded end of a screw 19. This screw is held at various adjustments by means of a nut 20. The micrometer is intended to be taken out of the bore 16 for has a circumferential.shoulder 24, and-situ ated in the cutter holder beside the shoulder there is a plurality of openings 25. each of which carries a cutter26. The cutters are held in place in the openings by set screws 27.

The operation may be readily understood from the following description. that the old bearing vcap 2 (Fig. 1) aswell as the flanges 4 and 21 ofythecrank shaft have become worn. The old cap must be re placed by a. new one which must first be trimmed before it will fit. 1 This trimming is necessarybecausean oversize bearing cap a must be used. The trimming is. done on the endflangest of the babbitt bushing 6.

The first step is to take the micrometer 17 out ofthe circular bore- 16 of thetool stand 7 and insert it in the spacebetween the flanges 4 and 21. The jam nut 20 is first loosened, whereuponthe screw 19 maybe worked out or in, until the micrometer fits the space mentioned. The jam nut is then reseated, and the micrometer is replacedv 1n the bore 16 of the trimming stand.

' The new,oversized bearing oap2 is placed upon the stand as shown inljigure 4.. The bolt flanges 12 rest on the block 13 and the tubular sleeve 9 on. the stand occupies the hollow place in thebushing 6 which will ultimately be occupied by the crank shaft. The bearing 2 is held in placeby one hand. The mandrel 10 of the cutter holder 11 is inserted in the tubular sleeve and the crank 22 is given a few turns withthe otherhand. The cutters 26-are of such design thatthey will properly space the flanges 5 aswell as chamfer the inner edge of the babbitt bushing.

Rotation; of the cutter holder continues until the circumferential shoulder 24 meets the micrometer screw '17; This limits the inward movement of both cutterholder and cutters so that the cutting or trimming operation must stop.

It is to be observed that the cutters 26 come out even with the circumferential shoulder 24, and all three cutters may be fit exactly alike by first removing the micrometer 17 and the bearing cap 2 and thereupon slipping the cutter holder inward and turning ituntil each cutter in turn comes up against the shoulder of the block 13. The

Assume inwardly thereof with,

reader will see that the block 13 extends out a little farther than the tubular sleeve 9, thereby providing a shoulder against which. the cutters may be set. This shoul der acts as a gauge for the setting of the cutters. The cutters are fixed in place by the set screws 27.

While the construction and arrangement "of the improved bearing trimming tool as which a bearing cap may. be held; aholder; having a plurality of openings, acutter fixed in each of the 0penings, .a mandrel on the holder revoluble in said sleeve, va crank handle on the holder. by which it is turned and the cutters aregheld against a bushing in the cap to trim the bushing, and'a-loose micrometer carried by the block but which is adjusted before mounting on the block tov be engaged by the holder after anumber of turns to limit thetrimming. action ofjthe cutters.

2. -A tool for. the purpose described coin prising a standhaving a block with atop concavity. and a bore, a tubulan sleeve on the stand occupying saidiconcavity the sleeve and block providing a support for the bearing cap. in an inverted position; a holder having an integral mandreliwh-ich is insertable into the-sleeve, ,-a -crank handle on theholder bywhich it is turned, plurality of .cutters carried by the-holder to trim theend of a bush-ing in the -cap,and a micrometer situated in, the; bore-of the block against which the holder restsqaifter a number of turns tostop the; trimming.

action of the cutters, said micrometerbeing composed of a stem, a screw which ispreviously adjusted in respect to. the stem, and means to fix the adjustments ofthe screw.

3. A tool for thepurpose described comprising .a stand having a tubular sleeve and a block upon which a bearing cap is supported a holder having a circumferential shoulder and a plurality of cutters situated t set g redflush with the shoulder, a mandrel. carried by the holder which is. revolu-ble i11 the sleeve so that the cuttersmay trim-the; end

of a bushing in ,the cap, av crank handle on the holder bywhich it is turned, and means serving the purpose of a m-icrometer{carried by the blockagai nstwhich said-. shoulder rubs after a number of turns of l the holder to stop the trimming action offlthe cutters.

d. A tool for the purpose described com prising a stand having an integral tubular sleeve, a block affixed to the stand extending a little beyond the end of the sleeve, a cut- 5 ter holder having a mandrel insertable in the sleeve and a circumferential shoulder on the holder Which may contact with the block, cutters carried by the holder which are engageable With the block to gauge the position of the cutters and means carried 1 by the holder to set the adjusted positions of the cutters.

TREIDER A. JENSEN. 

